Comments

SHA-256 and SHA-1 accelerated using ACE hardware.
Signed-off-by: ARUN MANKUZHI <arun.m@samsung.com>Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
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Changes since v1:
- Moved code to drivers/crypto.
- Fixed few other nits.
Changes since v2:
- Added falling back to software sha256 in case length exceeds buffer limit.
- Reduced one tab at lines 533, 559 and 571 in this patch.
- Removed space after a cast at line 506 in this patch.
- Removed blank line at line 561 in this patch.
- Removed space before semicolon at line 576 in this patch.
Changes since v3:
- Removed buffer limit since there are 2 regs for address hash_msg_size_high and low.
That means buffer length could go upto 2^64 bits which is practically
- Removed falling back to software sha256 because there is no buffer limit.
- Removed "/ 4" to sha1 and sha256 lengths and added increment to 4 in for loop at line 573.
- Timed out still kept to be 100 ms since this is enough for hardware to switch status to idle from busy.
In case it couldn't that means h/w is faulty.
Changes since v4:
- Added include for clk.h.
- Added define for MAX_FREQ.
- Added timeout calculation as per frequency.
- Changed "i+=4" to "i++" and "len" to "len/4" in for loop at line 591 in this patch.
- Added two new functions ace_sha256 and ace_sha1.
Makefile | 1 +
arch/arm/include/asm/arch-exynos/cpu.h | 4 +
drivers/crypto/Makefile | 47 +++++
drivers/crypto/ace_sfr.h | 310 +++++++++++++++++++++++++++++++++
drivers/crypto/ace_sha.c | 138 +++++++++++++++
include/ace_sha.h | 67 +++++++
6 files changed, 567 insertions(+)
create mode 100644 drivers/crypto/Makefile
create mode 100644 drivers/crypto/ace_sfr.h
create mode 100644 drivers/crypto/ace_sha.c
create mode 100644 include/ace_sha.h